【題目】In order for the experiment to be valid, it is ______ to record the data accurately.

A.essentialB.confidentialC.potentialD.definite

【答案】A

【解析】

考查形容詞詞義辨析。句意：為了使實(shí)驗(yàn)有效，必須準(zhǔn)確地記錄數(shù)據(jù)。A.essential基本的；B.confidential機(jī)密的；C.potential潛在的；D.definite明確的。根據(jù)句意，此處用固定詞組：be essential to“對(duì)……必不可少的”。此處是it作形式主語(yǔ)，動(dòng)詞不定式做真正的主語(yǔ)。故選A。

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